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Optical disc drive

a technology of optical discs and drives, applied in the field of optical disc drives, can solve the problems of increasing heat generation, increasing optical disc vibration,

Inactive Publication Date: 2009-12-29
HITACHI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an optical disc drive that increases the radiation of heat from the optical pickup without increasing sound noise and facilitates the radiation of heat generated by the disc rotation motor to the outside of the casing. The optical pickup includes a laser diode and an air duct, and a flexible tube with deformable material accommodates the movement of the optical pickup or the disc rotation motor. The tube allows air flow through it due to negative pressure created between the optical disc and the top case during the rotation of the optical disc. The heat transferred can be radiated to the outside of the optical disc drive through the top case by connecting the tube to the top case.

Problems solved by technology

Increases in the data transfer rates of optical disc drives have resulted in problems such as increases in optical disc vibrations due to higher rotation speeds or increases in heat generation due to increases in the output of motors for rotating optical discs and in the output of laser diodes.

Method used

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  • Optical disc drive
  • Optical disc drive
  • Optical disc drive

Examples

Experimental program
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Effect test

embodiment 1

[0023]FIGS. 1 to 9 show explanatory diagrams of a first embodiment of the present invention. FIG. 1 shows an exploded diagram of a main part of an optical disc drive as the first embodiment of the present invention. FIG. 2 shows a cross-sectional view taken along line A-A in FIG. 1. FIG. 3 shows a cross-sectional view taken along line B-B in FIG. 1. FIG. 4 shows a state in which the optical disc drive in FIG. 1 is being operated. FIG. 5 shows a cross-sectional view taken along line C-C in FIG. 1. FIGS. 6 and 7 show examples of the structure of an air duct in an optical pickup. FIG. 8 shows an example of the structure of a disc rotation motor-fixing-part air duct. FIG. 9 shows a structural example in which an optical pickup portion is provided with tubes.

[0024]In FIGS. 1 to 9, reference numeral 1 denotes an optical disc; 2 denotes a disc transfer member for transferring the optical disc 1; 2a denotes a penetrating hole in the disc transfer member 2; 3 denotes a disc rotation motor fo...

embodiment 2

[0050]FIG. 10 shows an explanatory diagram of a second embodiment of the present invention, and it shows a cross-sectional view taken along the same line as line B-B in FIG. 1.

[0051]In accordance with the second embodiment of the present invention, as shown in FIG. 10, the exit 14b of the tube 14 extending from the optical pickup 4 is connected to the space 18 surrounded by the clamp cover 17 and the clamp 16 in the depressed portion 9a of the top case. Since the space 18 is the region where pressure is reduced the most when the optical disc 1 is rotated, the differential pressure between the entrance of the tube 13 and the exit of the tube 14 is large. Thus, the quantity of air flowing through the tubes is increased, whereby the heat radiation characteristics of the optical pickup 4 can be improved.

[0052]The depressed portion 9a is a dent in the top case 9 opposite to the casing main body 6, and it has an opening in the bottom surface thereof. The clamp 16 is connected to the optic...

embodiment 3

[0054]FIG. 11 shows an explanatory diagram of a third embodiment of the present invention.

[0055]In the third embodiment of the present invention, regarding the tube 14 extending from the optical pickup 4, the top case 9 is used as part of the air duct, as shown in FIG. 11. With this structure, since part of the tube 14 comes into direct contact with the outside of the casing, the over-all coefficient of heat transmission is increased, thereby providing the advantage of increasing the amount of heat radiated to the outside of the optical disc drive when air flows through the tube 14.

[0056]Further, in the third embodiment of the present invention, regarding the tube 24 extending from the disc rotation motor 3, the top case 9 may be used as part of the air duct. With this structure, it is also possible to obtain the same effect on the disc rotation motor 3 as that on the optical pickup 4.

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Abstract

Increases in the data transfer rates of optical disc drives have resulted in problems such as increases in optical disc vibrations due to higher rotation speeds or increases in heat generation due to increases in the output of motors for rotating the optical discs and in the output of laser diodes. To solve such problems, an optical pickup is provided with an air duct therein, and a space that is formed between the optical disc and a top case of a casing and that has negative pressure during rotation of the optical disc is connected to the air duct in the optical pickup via a tube, at least part of the tube being deformable. The optical pickup is cooled by the air flow through the air duct induced by pressure difference.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an optical disc drive for recording or reading information on a recording medium on which information is optically recorded.BACKGROUND ART[0002]Increases in the data transfer rates of optical disc drives have resulted in problems such as increases in optical disc vibrations due to higher rotation speeds or increases in heat generation due to increases in the output of motors for rotating optical discs and in the output of laser diodes.[0003]For example, JP Patent Publication (Kokai) No. 2004-241024 A (to be hereinafter referred to as “Patent Document 1”) discloses an optical disc drive aimed at solving problems associated with such increases in data transfer rates. According to the invention disclosed in Patent Document 1, an opening is provided in a top case, and air is introduced into a casing by utilizing the negative pressure generated on the upper side of the disc when an optical disc is rotating, so as to perform coo...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G11B17/03
CPCG11B17/056G11B33/148G11B33/08G11B25/10
Inventor ISOSHIMA, NOBUYUKIFUJIMOTO, TAKAYUKIYAMAUCHI, YOSHIAKIKATOU, SEIICHINISHIDA, IKUONARUI, YOUICHI
Owner HITACHI LTD